CN205113001U - Driving device for electric automobile - Google Patents

Abstract

The utility model relates to the field of electric vehicles, and aims to provide an electric vehicle driving device. The electric vehicle driving device includes a motor and a gearbox. The gearbox is fixed on the motor, and the motor is provided with a first bearing and a gearbox. Rotor, one end of the rotor is installed on the inner ring of the first bearing, the other end of the rotor is provided with an internal spline, and the gearbox is provided with a second bearing, a third bearing, a fourth bearing, The input shaft and the output shaft, the outer ring of the second bearing and the outer ring of the third bearing are correspondingly arranged on two opposite sides of the gearbox. The beneficial effect of the utility model is that: the torque of the motor is transmitted to the rear axle of the electric vehicle after the transmission is changed, and the speed change of the electric vehicle is realized through the shift of the transmission, so that the motor can always work in the high-efficiency area, and the driving efficiency of the motor is high , low energy consumption.

Description

An electric vehicle driving device

technical field

The utility model relates to the field of electric vehicles, in particular to an electric vehicle driving device.

Background technique

A pure electric vehicle refers to a vehicle that is powered by a vehicle-mounted power supply, drives the wheels with a motor, and meets the requirements of road traffic and safety regulations. Due to its smaller impact on the environment than traditional cars, its prospects are widely optimistic. But now most of the pure electric vehicles use the motor directly connected to the rear axle to drive the vehicle, and the speed of the vehicle is adjusted by controlling the speed of the motor. In this control mode, there are three limiting factors: 1. Due to the limitation of the main reduction ratio of the rear axle, the maximum speed of the motor cannot be too high, and the torque of the motor cannot be too small, resulting in more materials for the iron core of the motor. Motors are bulky, bulky, and have suboptimal motor efficiency. Second, because it is directly driven by the motor, when the vehicle is running at low speed, the motor speed will inevitably drop to the low speed area, and when the motor runs in the low speed area, the efficiency is low. 3. When the braking energy is fed back, the motor speed is low, the power generation efficiency is low, and the energy recovery is small. Therefore, the use of motor direct drive will restrict the weight of the motor, increase energy consumption, and also restrict energy utilization and increase energy consumption.

Utility model content

The purpose of the utility model is to overcome the above defects and provide an electric vehicle driving device with high efficiency and low energy consumption.

In order to solve the above technical problems, the technical solution adopted by the utility model is:

A driving device for an electric vehicle, comprising a motor and a gearbox, the gearbox is fixed on the motor, the motor is provided with a first bearing and a rotor, and one end of the rotor is installed on the inner ring of the first bearing , the other end of the rotor is provided with internal splines, the gearbox is provided with a second bearing, a third bearing, a fourth bearing, an input shaft and an output shaft, the outer ring of the second bearing and the third bearing The outer rings of the gearbox are correspondingly arranged on two opposite sides of the gearbox, the input shaft is installed on the inner ring of the second bearing, and one end of the input shaft is provided with an outer spline matching the inner spline, the The other end of the input shaft is fixed with the outer ring of the fourth bearing, the input shaft is connected to the rotor through the cooperation of the outer spline and the inner spline, and one end of the output shaft is installed on the inner ring of the third bearing, so The other end of the output shaft is installed on the inner ring of the fourth bearing.

The beneficial effect of the utility model is that: the torque of the motor is transmitted to the rear axle of the electric vehicle through the gearbox, and the speed change of the electric vehicle is realized through the shift of the gearbox, so that the motor can always work in the high-efficiency zone, and the motor drive efficiency is high , low energy consumption, when the braking energy is fed back, the motor generates electricity with high efficiency, further reducing energy consumption. And the production of the motor can be improved according to the structural changes of the driving device. The motor can be designed to have a high speed and low torque, and the weight and volume of the motor can be significantly reduced, so that the motor can be lightweight. At the same time, the "motor + gearbox" drive The weight of the device assembly can be equal to or even smaller than that of the motor of the direct drive solution, which reduces material consumption and production costs. At the same time, in the structure of the drive device, only three bearings are used to fix the external structure from the rotor to the input shaft and then to the output shaft. , at the same time, the input shaft and the output shaft are fixed to each other through the fourth bearing, the outer ring of the fourth bearing is fixed on the input shaft, and the inner ring of the fourth bearing is fixed on the output shaft, so that the input shaft and the output shaft are mutually supported. To the supporting role, but they do not affect each other when rotating, saving the number of parts, making the overall structure of the driving device more compact, and reducing the volume of the driving device.

Description of drawings

Fig. 1 is the cross-sectional view of the electric vehicle driving device of the utility model embodiment;

Fig. 2 is a schematic diagram of the application of the electric vehicle driving device in the transmission system according to the embodiment of the present invention;

Fig. 3 is a schematic diagram of the application of the driving device of the electric vehicle according to the embodiment of the present invention on the vehicle.

Label description:

1. Motor; 2. Gearbox; 3. Bolt; 4. Transmission shaft; 11. First bearing; 12. Rotor; 13. Card slot; 21. Second bearing; 22. Third bearing; 23. Fourth bearing ; 24, input shaft; 25, output shaft; 26, buckle.

detailed description

In order to describe the technical content, structural features, achieved goals and effects of the present utility model in detail, the following will be described in detail in conjunction with the embodiments and accompanying drawings.

The most critical idea of the utility model is: the torque of the motor is transmitted to the rear axle of the electric vehicle after being shifted by the gearbox, and the speed change of the electric car is realized through the gear shift of the gearbox, so that the motor can always work in the high-efficiency zone, and the driving efficiency of the motor High, low energy consumption.

Please refer to Fig. 1 to Fig. 3, the electric vehicle driving device of the present embodiment includes a motor 1 and a gearbox 2, and the gearbox 2 is fixed on the motor 1, and the first bearing 11 and the first bearing 11 are arranged in the motor 1. A rotor 12, one end of the rotor 12 is installed on the inner ring of the first bearing 11, the other end of the rotor 12 is provided with internal splines, and the gearbox 2 is provided with a second bearing 21, a third Bearing 22, fourth bearing 23, input shaft 24 and output shaft 25, the outer ring of the second bearing 21 and the outer ring of the third bearing 22 are correspondingly arranged on two opposite sides of the gearbox 2, the input shaft 24 Installed on the inner ring of the second bearing 21, one end of the input shaft 24 is provided with an outer spline matched with the inner spline, and the other end of the input shaft 24 is fixed with the outer ring of the fourth bearing 23 , the input shaft 24 is connected to the rotor through the cooperation of external splines and internal splines, one end of the output shaft 25 is installed on the inner ring of the third bearing 22, the other end of the output shaft 25 is connected to the fourth bearing 23 on the inner circle.

The working process of the utility model is: the rotor 12 of the motor 1 is provided with internal splines, and the input shaft 24 of the gearbox 2 is provided with external splines and is interference fit with the internal splines of the rotor 12 of the motor 1 . The end cover of the gearbox 2 is connected and fixed with the housing of the motor 1 by the bolt 3 for the positioning of the notches. After the motor 1 is energized and rotates, it drives the input shaft 24 of the gearbox 2 to rotate and transmit torque. The input shaft 24 of the gearbox 2 converts the speed and torque relationship through the corresponding gear, and transmits power to the output shaft 25 of the gearbox 2, and the output shaft 25 outputs the power to the rear axle to drive the wheels to rotate.

As can be seen from the above description, the beneficial effect of the utility model is that: the torque of the motor 1 is transmitted to the rear axle of the electric vehicle after being shifted by the gearbox 2, and the speed change of the electric vehicle is realized by the gear conversion of the gearbox 2, so that the motor 1 can always Working in the high-efficiency zone, the motor 1 has high driving efficiency and low energy consumption. When the braking energy is fed back, the motor 1 has high power generation efficiency and further reduces energy consumption. And the production of the motor 1 can be improved according to the structural changes of the driving device. The motor 1 can be designed to have a high speed and low torque, and the weight and volume of the motor 1 can be significantly reduced, so that the weight of the motor 1 can be reduced. The weight of the driving device assembly such as the box 2" can be equivalent to the weight of the motor 1 of the direct drive scheme, or even smaller, reducing materials and reducing production costs. At the same time, in the structure of the driving device, the 25 only uses three bearings to fix the external structure, and the input shaft 24 and the output shaft 25 are fixed to each other through the fourth bearing 23, the outer ring of the fourth bearing 23 is fixed on the input shaft 24, and the inner ring of the fourth bearing 23 It is fixed on the output shaft 25, so that the input shaft 24 and the output shaft 25 can support each other, but they do not affect each other when they rotate, which saves the number of parts, makes the overall structure of the drive device more compact, and reduces the weight of the drive device. volume.

Further, the gearbox 2 is provided with a buckle 26, and the motor 1 is provided with a slot 13 matched with the buckle 26, and the gearbox 2 and the motor 1 are connected through the buckle 26 and the slot. The cooperation of 13 is positioned mutually.

It can be seen from the above description that the gearbox 2 and the motor 1 can be quickly positioned through the cooperation of the buckle 26 and the slot 13, which improves the efficiency of production and assembly, and the installation is firm, which improves the quality of the product.

Further, a bolt 3 is also included, and the gearbox 2 is fixed on the motor 1 through the bolt 3 .

It can be seen from the above description that the bolt 3 is firmly fixed, and at the same time, it is easy to disassemble and assemble, and is convenient for maintenance and regular inspection.

Further, a transmission shaft 4 is also included, and the output shaft 25 is connected with the transmission shaft 4 .

It can be seen from the above description that the output shaft 25 is connected with the transmission shaft 4, and the transmission shaft 4 is connected with the rear axle of the automobile to drive the rear wheels of the automobile to rotate.

Please refer to Fig. 1 to Fig. 3 shown, embodiment one of the present utility model is:

An electric vehicle driving device, comprising a motor 1 and a gearbox 2, the gearbox 2 is fixed on the motor 1, a first bearing 11 and a rotor 12 are arranged inside the motor 1, and one end of the rotor 12 is installed on the On the inner ring of the first bearing 11, the other end of the rotor 12 is provided with an internal spline, and the gearbox 2 is provided with a second bearing 21, a third bearing 22, a fourth bearing 23, an input shaft 24 and The output shaft 25, the outer ring of the second bearing 21 and the outer ring of the third bearing 22 are correspondingly arranged on two opposite sides of the gearbox 2, and the input shaft 24 is installed on the inner ring of the second bearing 21, so One end of the input shaft 24 is provided with an external spline matched with the internal spline, and the other end of the input shaft 24 is fixed with the outer ring of the fourth bearing 23, and the input shaft 24 is connected to the internal spline through the external spline. The fit of the spline is connected with the rotor, one end of the output shaft 25 is installed on the inner ring of the third bearing 22, the other end of the output shaft 25 is on the inner ring of the fourth bearing 23, and on the gearbox 2 A buckle 26 is provided, and the motor 1 is provided with a slot 13 matched with the buckle 26. The gearbox 2 and the motor 1 are mutually positioned through the cooperation of the buckle 26 and the slot 13, and bolts are also included. 3. The gearbox 2 is fixed on the motor 1 through bolts 3, and also includes a transmission shaft 4, and the output shaft 25 is connected to the transmission shaft 4.

To sum up, in the electric vehicle driving device provided by the utility model, the torque of the motor is transmitted to the rear axle of the electric vehicle after being shifted through the gearbox, and the speed change of the electric vehicle is realized through the gear change of the gearbox, so that the motor can always work at In the high-efficiency zone, the motor drives with high efficiency and low energy consumption. When the braking energy is fed back, the motor generates electricity with high efficiency, further reducing energy consumption. And the production of the motor can be improved according to the structural changes of the driving device. The motor can be designed to have a high speed and low torque, and the weight and volume of the motor can be significantly reduced, so that the motor can be lightweight. At the same time, the "motor + gearbox" drive The weight of the device assembly can be equal to or even smaller than that of the motor of the direct drive solution, which reduces material consumption and production costs. At the same time, in the structure of the drive device, only three bearings are used to fix the external structure from the rotor to the input shaft and then to the output shaft. , at the same time, the input shaft and the output shaft are fixed to each other through the fourth bearing, the outer ring of the fourth bearing is fixed on the input shaft, and the inner ring of the fourth bearing is fixed on the output shaft, so that the input shaft and the output shaft are mutually supported. To support, but do not affect each other when rotating, save the number of parts, make the overall structure of the drive device more compact, reduce the volume of the drive device, through the cooperation of the buckle and the slot, the gearbox and the motor can be positioned quickly, improving The production and assembly efficiency is high, and the installation is firm, which improves product quality. The bolts are firmly fixed, and at the same time, it is easy to disassemble and assemble, which is convenient for maintenance and regular inspection.

The above is only an embodiment of the utility model, and does not limit the patent scope of the utility model. Any equivalent structure or equivalent process conversion made by using the utility model specification and accompanying drawings, or directly or indirectly used in other Related technical fields are all included in the patent protection scope of the present utility model in the same way.

Claims (4)

1. An electric vehicle driving device, characterized in that: it comprises a motor and a gearbox, the gearbox is fixed on the motor, the motor is provided with a first bearing and a rotor, and one end of the rotor is installed on the second On the inner ring of a bearing, the other end of the rotor is provided with an internal spline, and the gearbox is provided with a second bearing, a third bearing, a fourth bearing, an input shaft and an output shaft, and the second bearing The outer ring and the outer ring of the third bearing are correspondingly arranged on two opposite sides of the gearbox, the input shaft is installed on the inner ring of the second bearing, and one end of the input shaft is provided with a spline matched with the inner spline External spline, the other end of the input shaft is fixed with the outer ring of the fourth bearing, the input shaft is connected with the rotor through the cooperation of the external spline and the internal spline, and one end of the output shaft is installed on the third bearing On the inner ring of the output shaft, the other end of the output shaft is installed on the inner ring of the fourth bearing. 2. The electric vehicle driving device according to claim 1, characterized in that: the gearbox is provided with buckles, and the motor is provided with a slot matching the buckles, and the gearbox and The motors are positioned with each other through the cooperation of the buckle and the slot. 3. The electric vehicle driving device according to claim 1, further comprising bolts, the gearbox is fixed on the motor by bolts. 4. The electric vehicle driving device according to claim 1, further comprising a transmission shaft, the output shaft is connected to the transmission shaft.